C# if else statement not working exactly right

Hello, we are working on a web form project where the first page asks the visitor a question. Depending on the radio group selection value, the user should redirect to a page based on their selected value. Below is the code we are using. What seems to happen, is that if you pick "home", it will go to home.aspx correctly, but if you hit your browser back button and then select "church", it will take you to home.aspx incorrectly.

If I open a different web browser (just to use a totally different browser that has no history of this site) and select "church", it will go to church.aspx, but if you hit your browser back button and then select home, it will take you to church.aspx incorrectly.

Does anyone have any advise on how to get this to work well? Thanks in advance, It seems like we are close but missing something simple.

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